How severe is CVE-2021-42662?

CVE-2021-42662 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-42662 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2021-42662?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-42662 published?

CVE-2021-42662 was published on 2021-11-05 and last updated on 2026-06-17.

CVE-2021-42662

CVE-2021-42662 is a medium-severity vulnerability in Online Event Booking And Reservation System Project Online Event Booking And Reservation System with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Online Event Booking And Reservation System Project Online Event Booking And Reservation System
Published: 2021-11-05
Last modified: 2026-06-17

Description

A Stored Cross Site Scripting (XSS) vulnerability exists in Sourcecodester Online Event Booking and Reservation System in PHP/MySQL via the Holiday reason parameter. An attacker can leverage this vulnerability in order to run javascript commands on the web server surfers behalf, which can lead to cookie stealing and more.

Frequently asked questions

What is CVE-2021-42662?: A Stored Cross Site Scripting (XSS) vulnerability exists in Sourcecodester Online Event Booking and Reservation System in PHP/MySQL via the Holiday reason parameter. An attacker can leverage this vulnerability in order to run javascript commands on the web server surfers behalf, which can lead to cookie stealing and more.
How severe is CVE-2021-42662?: CVE-2021-42662 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-42662 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42662?: CVE-2021-42662 affects Online Event Booking And Reservation System Project Online Event Booking And Reservation System. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-42662?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-42662 published?: CVE-2021-42662 was published on 2021-11-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:online_event_booking_and_reservation_system_project:online_event_booking_and_reservation_system:2.3.0:*:*:*:*:*:*:*

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